/*************************************************************************/
/*  vulkan_context.h                                                     */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
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#ifndef VULKAN_CONTEXT_H
#define VULKAN_CONTEXT_H

#include "core/error_list.h"
#include "core/map.h"
#include "core/os/mutex.h"
#include "core/rid_owner.h"
#include "core/ustring.h"
#include "servers/display_server.h"
#include <vulkan/vulkan.h>

class VulkanContext {
	enum {
		MAX_EXTENSIONS = 128,
		MAX_LAYERS = 64,
		FRAME_LAG = 2
	};

	VkInstance inst;
	VkSurfaceKHR surface;
	VkPhysicalDevice gpu;
	VkPhysicalDeviceProperties gpu_props;
	uint32_t queue_family_count;
	VkQueueFamilyProperties *queue_props;
	VkDevice device;
	bool device_initialized = false;
	bool inst_initialized = false;

	//present
	bool queues_initialized;
	uint32_t graphics_queue_family_index;
	uint32_t present_queue_family_index;
	bool separate_present_queue;
	VkQueue graphics_queue;
	VkQueue present_queue;
	VkColorSpaceKHR color_space;
	VkFormat format;
	VkSemaphore image_acquired_semaphores[FRAME_LAG];
	VkSemaphore draw_complete_semaphores[FRAME_LAG];
	VkSemaphore image_ownership_semaphores[FRAME_LAG];
	int frame_index;
	VkFence fences[FRAME_LAG];
	VkPhysicalDeviceMemoryProperties memory_properties;
	VkPhysicalDeviceFeatures physical_device_features;

	typedef struct {
		VkImage image;
		VkCommandBuffer graphics_to_present_cmd;
		VkImageView view;
		VkFramebuffer framebuffer;

	} SwapchainImageResources;

	struct Window {
		VkSurfaceKHR surface = VK_NULL_HANDLE;
		VkSwapchainKHR swapchain = VK_NULL_HANDLE;
		SwapchainImageResources *swapchain_image_resources = VK_NULL_HANDLE;
		VkPresentModeKHR presentMode = VK_PRESENT_MODE_FIFO_KHR;
		uint32_t current_buffer = 0;
		int width = 0;
		int height = 0;
		VkCommandPool present_cmd_pool; //for separate present queue
		VkRenderPass render_pass = VK_NULL_HANDLE;
	};

	struct LocalDevice {
		bool waiting = false;
		VkDevice device;
		VkQueue queue;
	};

	RID_Owner<LocalDevice, true> local_device_owner;

	Map<DisplayServer::WindowID, Window> windows;
	uint32_t swapchainImageCount;

	//commands

	bool prepared;

	//extensions
	bool VK_KHR_incremental_present_enabled;
	bool VK_GOOGLE_display_timing_enabled;
	const char **instance_validation_layers;
	uint32_t enabled_extension_count;
	uint32_t enabled_layer_count;
	const char *extension_names[MAX_EXTENSIONS];
	const char *enabled_layers[MAX_LAYERS];

	PFN_vkCreateDebugUtilsMessengerEXT CreateDebugUtilsMessengerEXT;
	PFN_vkDestroyDebugUtilsMessengerEXT DestroyDebugUtilsMessengerEXT;
	PFN_vkSubmitDebugUtilsMessageEXT SubmitDebugUtilsMessageEXT;
	PFN_vkCmdBeginDebugUtilsLabelEXT CmdBeginDebugUtilsLabelEXT;
	PFN_vkCmdEndDebugUtilsLabelEXT CmdEndDebugUtilsLabelEXT;
	PFN_vkCmdInsertDebugUtilsLabelEXT CmdInsertDebugUtilsLabelEXT;
	PFN_vkSetDebugUtilsObjectNameEXT SetDebugUtilsObjectNameEXT;
	PFN_vkGetPhysicalDeviceSurfaceSupportKHR fpGetPhysicalDeviceSurfaceSupportKHR;
	PFN_vkGetPhysicalDeviceSurfaceCapabilitiesKHR fpGetPhysicalDeviceSurfaceCapabilitiesKHR;
	PFN_vkGetPhysicalDeviceSurfaceFormatsKHR fpGetPhysicalDeviceSurfaceFormatsKHR;
	PFN_vkGetPhysicalDeviceSurfacePresentModesKHR fpGetPhysicalDeviceSurfacePresentModesKHR;
	PFN_vkCreateSwapchainKHR fpCreateSwapchainKHR;
	PFN_vkDestroySwapchainKHR fpDestroySwapchainKHR;
	PFN_vkGetSwapchainImagesKHR fpGetSwapchainImagesKHR;
	PFN_vkAcquireNextImageKHR fpAcquireNextImageKHR;
	PFN_vkQueuePresentKHR fpQueuePresentKHR;
	PFN_vkGetRefreshCycleDurationGOOGLE fpGetRefreshCycleDurationGOOGLE;
	PFN_vkGetPastPresentationTimingGOOGLE fpGetPastPresentationTimingGOOGLE;

	VkDebugUtilsMessengerEXT dbg_messenger;

	Error _create_validation_layers();
	Error _initialize_extensions();

	VkBool32 _check_layers(uint32_t check_count, const char **check_names, uint32_t layer_count, VkLayerProperties *layers);
	static VKAPI_ATTR VkBool32 VKAPI_CALL _debug_messenger_callback(VkDebugUtilsMessageSeverityFlagBitsEXT messageSeverity,
			VkDebugUtilsMessageTypeFlagsEXT messageType,
			const VkDebugUtilsMessengerCallbackDataEXT *pCallbackData,
			void *pUserData);

	Error _create_physical_device();

	Error _initialize_queues(VkSurfaceKHR surface);

	Error _create_device();

	Error _clean_up_swap_chain(Window *window);

	Error _update_swap_chain(Window *window);

	Error _create_swap_chain();
	Error _create_semaphores();

	Vector<VkCommandBuffer> command_buffer_queue;
	int command_buffer_count;

protected:
	virtual const char *_get_platform_surface_extension() const = 0;
	//	virtual VkResult _create_surface(VkSurfaceKHR *surface, VkInstance p_instance) = 0;

	virtual Error _window_create(DisplayServer::WindowID p_window_id, VkSurfaceKHR p_surface, int p_width, int p_height);

	VkInstance _get_instance() {
		return inst;
	}

	bool buffers_prepared;

	bool use_validation_layers;

public:
	VkDevice get_device();
	VkPhysicalDevice get_physical_device();
	int get_swapchain_image_count() const;
	uint32_t get_graphics_queue() const;

	void window_resize(DisplayServer::WindowID p_window_id, int p_width, int p_height);
	int window_get_width(DisplayServer::WindowID p_window = 0);
	int window_get_height(DisplayServer::WindowID p_window = 0);
	void window_destroy(DisplayServer::WindowID p_window_id);
	VkFramebuffer window_get_framebuffer(DisplayServer::WindowID p_window = 0);
	VkRenderPass window_get_render_pass(DisplayServer::WindowID p_window = 0);

	RID local_device_create();
	VkDevice local_device_get_vk_device(RID p_local_device);
	void local_device_push_command_buffers(RID p_local_device, const VkCommandBuffer *p_buffers, int p_count);
	void local_device_sync(RID p_local_device);
	void local_device_free(RID p_local_device);

	VkFormat get_screen_format() const;
	VkPhysicalDeviceLimits get_device_limits() const;

	void set_setup_buffer(const VkCommandBuffer &pCommandBuffer);
	void append_command_buffer(const VkCommandBuffer &pCommandBuffer);
	void resize_notify();
	void flush(bool p_flush_setup = false, bool p_flush_pending = false);
	Error prepare_buffers();
	Error swap_buffers();
	Error initialize();

	VulkanContext();
	virtual ~VulkanContext();
};

#endif // VULKAN_DEVICE_H
